The doctrine of Creation does a lot more than we give it credit for.
If God created everything and out of nothing, then we didn’t. And if we didn’t everything is grace. Everything comes to us a gift, undeserved favor in every nook and cranny. But this also means that salvation is necessarily a gift also. Not that we don’t think that already. But we often put a lot of our effort into showing that we are unable to save ourselves (total depravity, irrisistable grace…) all that stuff. I’m of course in agreement with the point of it all. But it seems like Creation already affirms that nothing is ours to take credit for ultimately.
In the story of history we do things, we have things, we use things, and in so far as Creation is real, we really act, do, have, and use things. No problem. But in so far as God created it all, it’s all from Him and for Him. We’re not gnostics: faith has a body. But the body was created. So when it comes to salvation of course we’re saved by grace and that not of ourselves: it was a gift. “Not of works so that no man can boast” seems like another way of saying… you didn’t make yourself, silly.
Pelagianism and anyone else wanting to give some credit to man must be at their foundations creational heresies. A denial of sola gratia is an attempt at retelling the creation story. So also with every form of ingratitude. We’d have made it better, we grumble to ourselves.
This is why salvation is rightly described as re-creation.